#Subquery In Sql

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#Subquery In Sql Reel by @dataxodyssey - Day 29 SQL ๐Ÿ”ฅ | Tech Company Interview Question

SAVE this and SHARE with your Data Analyst batch ๐Ÿ“Š

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๐Ÿ‘‰ www.youtube
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Day 29 SQL ๐Ÿ”ฅ | Tech Company Interview Question SAVE this and SHARE with your Data Analyst batch ๐Ÿ“Š ๐Ÿ“บ Follow on YouTube: Link in Bio ๐Ÿ‘‰ www.youtube.com/@DataXOdyssey ๐Ÿšซ COMMON DATA ISSUE (VERY IMPORTANT) โŒ Duplicate rows = wrong reports โŒ Double counting users/employees โŒ Poor data quality โœ… SQL helps you identify duplicates instantly ๐ŸŽฏ INTERVIEW TIP (SAVE THIS) ๐Ÿ’ก Duplicates are found using GROUP BY + HAVING ๐Ÿ’ก Multiple columns are checked together, not separately ๐Ÿ’ก This question is asked in almost every tech interview ๐Ÿ‘‰ Interviewers test your data thinking, not just syntax. ๐Ÿง  WHAT YOU LEARN IN THIS VIDEO (Beginner Friendly) โœ… 1๏ธโƒฃ Identify duplicate values SELECT name, department, position_title, COUNT(*) FROM employees GROUP BY name, department, position_title HAVING COUNT(*) > 1; ๐Ÿ“Œ Groups identical records ๐Ÿ“Œ Counts how many times they appear ๐Ÿ“Œ Shows only repeated entries ๐Ÿ“Œ REAL-WORLD MEANING If the same Name + Department + Role appears more than once, ๐Ÿ‘‰ itโ€™s treated as a duplicate record ๐Ÿ”ฅ WHY THIS MATTERS โ€ข Prevents incorrect reports โ€ข Improves data accuracy โ€ข Essential for Data Analysts SAVE this for revision ๐Ÿ“Œ SHARE with your SQL/interview buddy ๐Ÿค Check Out Day 18: WHERE vs HAVING (must-watch) #SQLInterview #LearnSQL #DataAnalyst #TechInterviews #MySQL #DataAnalytics #CodingReels #SQLTutorial #SQLHacks
#Subquery In Sql Reel by @dataxodyssey - ๐Ÿ”ฅ Day 37: This Question HUMBLES 90% Candidates ๐Ÿ˜ฎโ€๐Ÿ’จ

Most people answer it half rightโ€ฆ
Interviewers notice instantly โš ๏ธ

๐Ÿ’พ SAVE this for SQL interv
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๐Ÿ”ฅ Day 37: This Question HUMBLES 90% Candidates ๐Ÿ˜ฎโ€๐Ÿ’จ Most people answer it half rightโ€ฆ Interviewers notice instantly โš ๏ธ ๐Ÿ’พ SAVE this for SQL interviews ๐Ÿ‘ฅ SHARE with your Data Analyst batch ๐Ÿ“Œ Follow @dataxodyssey for Daily SQL Interview Prep ๐Ÿ† INTERVIEW GOLD Subqueries test: โœ” logical thinking โœ” query layering โœ” business understanding โœ” real-world SQL usage Master this = easy interview win โ“ Interview Question Display employees whose salary is GREATER than the average salary Sounds easy? Hereโ€™s where people fail ๐Ÿ‘‡ โŒ They calculate average manually โŒ They hard-code values โŒ They forget SQL should handle dynamic data ๐Ÿ’ก INTERVIEWER EXPECTS THIS ๐Ÿ‘‰ Use a SUBQUERY ๐Ÿ‘‰ Let SQL calculate the average ๐Ÿ‘‰ Compare salaries dynamically This works even when: โœ” salaries change โœ” new employees are added โœ” real production data grows #SQLInterview #SQLSubquery #LearnSQL #DataAnalystInterview #SQLTips #DailySQL #DataAnalystLife #TechCareers #IndianTech #AnalyticsJobs #SQLForBeginners #CareerInData #DataXOdyssey
#Subquery In Sql Reel by @dataengnotebook - Find the Median Salary - Real Interview Question

Average is easy.
Median? That's where SQL gets interesting ๐Ÿ‘€

Why?
Because SQL doesn't have a simpl
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@dataengnotebook
Find the Median Salary โ€” Real Interview Question Average is easy. Median? Thatโ€™s where SQL gets interesting ๐Ÿ‘€ Why? Because SQL doesnโ€™t have a simple built-in MEDIAN() in most databases. So what do we do? ๐Ÿ‘‡ โœ” Use ROW_NUMBER() โœ” Use COUNT() as window function โœ” Handle even vs odd number of rows โœ” Take the middle value (or average of two) This question tests: ๐Ÿ”น Window function depth ๐Ÿ”น Edge case thinking ๐Ÿ”น Analytical SQL problem-solving If you can solve MEDIAN confidently, youโ€™re already above average ๐Ÿš€ #SQLInterview #WindowFunctions #AdvancedSQL #LearnSQL #DataEngineering
#Subquery In Sql Reel by @dataxodyssey - Day 40: 10 Characters โ‰  10 Bytes ๐Ÿ˜ฎโ€๐Ÿ’จ LENGTH vs CHAR_LENGTH

Everyone thinks name limits are SIMPLEโ€ฆ
Until Unicode enters the database ๐Ÿ‘€

Characters
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@dataxodyssey
Day 40: 10 Characters โ‰  10 Bytes ๐Ÿ˜ฎโ€๐Ÿ’จ LENGTH vs CHAR_LENGTH Everyone thinks name limits are SIMPLEโ€ฆ Until Unicode enters the database ๐Ÿ‘€ Characters โŒ Bytes โŒ Emoji โŒ Regional letters โŒ ๐Ÿ’พ SAVE this for SQL interviews ๐Ÿ‘ฅ SHARE with your Data Analyst batch ๐Ÿ“Œ Follow @dataxodyssey for Daily SQL Interview Prep Interview Question A system allows employee names up to 10 characters, but the database column is limited to 10 bytes. Why does this cause errors? Which function would you use to detect risky names? Sounds basic? This is where candidates slip ๐Ÿ‘‡ โŒ Common Mistakes โŒ Assuming characters = bytes โŒ Using CHAR_LENGTH for storage validation โŒ Ignoring Unicode data โŒ Learning SQL only at surface level SELECT LENGTH(employee_name) FROM employees; โœ” LENGTH checks bytes โœ” Detects Unicode overflow โœ” Prevents insert failures โœ” Production-safe logic SELECT CHAR_LENGTH(employee_name) FROM employees; ๐Ÿ‘‰ Counts characters (display logic, not storage) ๐ŸŽฏ Why Interviewers Ask This Tests: โœ” Unicode awareness โœ” Storage vs display difference โœ” Real-world SQL thinking โœ” System design basics Simple on paper. Dangerous in production ๐Ÿง  #SQLInterview #SQLStringFunctions #SQLTips #DailySQL #DataAnalystInterview #SQLForBeginners #AdvancedSQL #AnalyticsCareers #TechCareers #IndianTech #CareerInData #DataXOdyssey
#Subquery In Sql Reel by @dataxodyssey - Day 24 SQL ๐Ÿ”ฅ| This SQL NULL mistake can fail your interview โŒ
IFNULL vs COALESCE explained simply.

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Day 24 SQL ๐Ÿ”ฅ| This SQL NULL mistake can fail your interview โŒ IFNULL vs COALESCE explained simply. SAVE this and SHARE with your Data Analyst batch ๐Ÿ“Š ๐Ÿ“บ Follow on YouTube: Link in Bio ๐Ÿ‘‰ www.youtube.com/@DataXOdyssey โ“ Problem Your SQL results may look correct โ€” but still be wrong โŒ When data contains NULL, calculations and reports can breakโ€ฆ โœ… IFNULL() โ€“ Replace NULL with a default value SELECT IFNULL(Salary, 0) AS Salary FROM employees; ๐Ÿ‘‰ If Salary is NULL โ†’ replace it with 0 ๐Ÿ‘‰ Works with only ONE fallback value โœ… COALESCE() โ€“ Pick first non-NULL value SELECT COALESCE(Salary, Bonus, 0) AS Final_Pay FROM employees; ๐Ÿ‘‰ Checks values from left to right ๐Ÿ‘‰ Returns the first value that is NOT NULL ๐Ÿ‘‰ Can handle multiple columns ๐ŸŽฏ Interview Tip: Use COALESCE when multiple fallback values are possible Use IFNULL when logic is simple and limited ๐Ÿง  Understand the difference (IMPORTANT ๐Ÿ‘‡) โ€ข IFNULL โœ” Simple โœ” Only 2 arguments โœ” Good when you need one replacement โ€ข COALESCE โœ” More powerful โœ” Multiple arguments โœ” Works across different SQL databases โœ” Preferred in real-world analytics ๐Ÿ“Œ This is why COALESCE is more flexible than IFNULL ๐Ÿ“Œ Part of Daily SQL Series โ€“ Day 24 ๐Ÿ” Missed earlier days? Check out previous videos to learn SQL from scratch ๐Ÿ” Save this ๐Ÿ“Œ Follow for daily SQL learning ๐Ÿ” DAY SERIES FLOW ๐Ÿ‘‰ Check Out Day 23: NULL vs IS NULL vs IS NOT NULL #LearnSQL #SQLTutorial #SQLTips #SQLBeginners #DataAnalytics #DataAnalystJourney #SQLInterview #TechCareers #MySQL #PostgreSQL #Day24SQL #DataXOdyssey
#Subquery In Sql Reel by @khan.the.analyst (verified account) - ๐Ÿ”ฅ Want FREE SQL resources?
Comment "SQL" ๐Ÿ‘‡

You'll receive:
โœ” SQL Notes (Beginner-friendly)
โœ” SQL LeetCode Q&A
โœ” Interview-focused SQL questions
โœ” P
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@khan.the.analyst
๐Ÿ”ฅ Want FREE SQL resources? Comment โ€œSQLโ€ ๐Ÿ‘‡ Youโ€™ll receive: โœ” SQL Notes (Beginner-friendly) โœ” SQL LeetCode Q&A โœ” Interview-focused SQL questions โœ” Practice sets (Basic โ†’ Advanced) These helped me crack real Data Analyst interviews. โธป ๐Ÿ“ž 1:1 Mentorship | Resume Review | Mock Interviews ๐Ÿ‘‰ Link in Bio ๐Ÿ’พ Save | ๐Ÿ“ค Share | ๐Ÿ‘ค Follow @khan.the.analyst #SQL #SQLLearning #DataAnalytics #SQLInterview #careerindata
#Subquery In Sql Reel by @dataxodyssey - Not a hard question. But it filters weak SQL fundamentals instantly.

Know:
โœ” Date functions
โœ” GROUP BY
โœ” COUNT

Save this for your next interview. Fo
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@dataxodyssey
Not a hard question. But it filters weak SQL fundamentals instantly. Know: โœ” Date functions โœ” GROUP BY โœ” COUNT Save this for your next interview. Follow @dataxodyssey for daily learnings #SQL #SQLInterview #DataAnalyst #LearnSQL #DataEngineer #TechCareers #Database #Analytics #dataxodyssey
#Subquery In Sql Reel by @cloudydata.ajay (verified account) - Be honest ๐Ÿ‘‡
How many of these SQL interview questions can you solve?

Comment your number.
(Save this - you'll thank yourself before interviews.)

Co
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@cloudydata.ajay
Be honest ๐Ÿ‘‡ How many of these SQL interview questions can you solve? Comment your number. (Save this โ€” youโ€™ll thank yourself before interviews.) Comment SQL to get this complete PDF in your DM ๐Ÿ“ฅ Follow @cloudydata.ajay for Analytics, SQL & data interview practice Tags : #sqlinterview #sqlpractice #dataanalytics #datascience #interviewprep
#Subquery In Sql Reel by @dataxodyssey - Day 45 | CURDATE vs CURRENT_DATE & NOW vs CURRENT_TIMESTAMP

๐Ÿ’พ SAVE this for SQL interviews
๐Ÿ‘ฅ SHARE with your PEERS

๐Ÿ“Œ Follow @dataxodyssey for Dai
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Day 45 | CURDATE vs CURRENT_DATE & NOW vs CURRENT_TIMESTAMP ๐Ÿ’พ SAVE this for SQL interviews ๐Ÿ‘ฅ SHARE with your PEERS ๐Ÿ“Œ Follow @dataxodyssey for Daily SQL Interview Prep Dates look SIMPLE. But interviews test your precision REMEMBER THIS โ€ข CURDATE & NOW โ†’ MySQL flavor โ€ข CURRENT_DATE & CURRENT_TIMESTAMP โ†’ SQL standard #SQL #MySQL #LearnSQL #SQLInterview #SQLTips #DataAnalyst #DataAnalytics #AnalyticsCareers #TechCareers #DailySQL #SQLTricks #SQLForBeginners #AdvancedSQL #DataXOdyssey
#Subquery In Sql Reel by @codemeetstech (verified account) - This is a basic but tricky DSA interview question.

Why is insertion faster in a linked list than in an array?

1๏ธโƒฃ Array needs shifting
When you inse
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@codemeetstech
This is a basic but tricky DSA interview question. Why is insertion faster in a linked list than in an array? 1๏ธโƒฃ Array needs shifting When you insert an element in the middle of an array, all elements after that position must shift. Example: Insert at index 2 โ†’ elements move right. Time complexity: O(n) 2๏ธโƒฃ Linked list only updates pointers In a linked list, you just change the next pointer. Example: A โ†’ B โ†’ C Insert D after B A โ†’ B โ†’ D โ†’ C No shifting required. Time complexity: O(1) (if position known) 3๏ธโƒฃ Memory layout difference Arrays store elements in contiguous memory. Linked lists store elements scattered in memory with pointers. ๐ŸŽฏ Interview takeaway Array insertion โ†’ move many elements Linked list insertion โ†’ update pointers Pointer change is cheaper than shifting data. { DataStructures, Algorithms, Coding, Programming, SoftwareDevelopment, ComputerScience, DSA, BackendDeveloper, LearnToCode, TechCareers } #DataStructures #Algorithms #Coding #ComputerScience #TechExplained
#Subquery In Sql Reel by @dataxodyssey - Day 53 | RIGHT JOIN Explained Simply

Yesterday we kept all employees.
Today we keep all salaries.

Same tables.
Different logic.

This is where inter
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@dataxodyssey
Day 53 | RIGHT JOIN Explained Simply Yesterday we kept all employees. Today we keep all salaries. Same tables. Different logic. This is where interviews eliminate candidates. Understand JOIN direction. Donโ€™t memorize it. SAVE this and SHARE with your SQL batch Follow @dataxodyssey for complete series SELECT e.employee_id, e.employee_name, s.salary FROM employees e RIGHT JOIN salary s ON e.employee_id = s.employee_id; โœ… All records from RIGHT table + โœ… Matching records from LEFT table Meaning: โ€ข Salary exists โ†’ WILL appear โ€ข Employee exists โ†’ will show โ€ข Employee missing โ†’ shows NULL Important Difference INNER JOIN โ†’ Only matching rows LEFT JOIN โ†’ Keep all LEFT table rows RIGHT JOIN โ†’ Keep all RIGHT table rows #SQL #SQLInterview #AdvancedSQL #DataAnalystInterview #SQLTips #DailySQL #AnalyticsJobs #TechCareers #SQLForBeginners #CareerInData #DataXOdyssey #ReelItFeelIt #LearnSQL #Database #DataEngineer #TechJobs #SQLHacks #SQLTutorial
#Subquery In Sql Reel by @dataxodyssey - Day 36: Most SQL learners get this WRONG in interviews

They say "Top 3 employees by salary"
But forget ONE critical detail ๐Ÿ‘‡

๐Ÿ‘‰ What if multiple em
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@dataxodyssey
Day 36: Most SQL learners get this WRONG in interviews They say โ€œTop 3 employees by salaryโ€ But forget ONE critical detail ๐Ÿ‘‡ ๐Ÿ‘‰ What if multiple employees have the SAME salary? Interviewers WANT you to think about ties. โ“ Interview Question Retrieve Top 3 employees by salary in each department โœ” department-wise โœ” highest salary first โœ” include employees with same salary If you use ROW_NUMBER() โŒ โ€” youโ€™ll miss people. INTERVIEW GOLD ๐Ÿ† Use DENSE_RANK() with PARTITION BY. This is how real analysts: โœ” avoid unfair filtering โœ” handle real-world data โœ” write production-ready SQL ๐Ÿ’พ Save this for interviews ๐Ÿ‘ฅ Share with your SQL batch Follow @dataxodyssey for daily SQL interview prep ๐Ÿš€ #SQLInterview #TopNSQL #WindowFunctions #DENSE_RANK #LearnSQL #DataAnalystLife #TechInterviews #DailySQL #IndianTech #SQLTips

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